Doorcheck



Patented Dec. 5, 1933 'PATENT OFFICE 1 Earl s.` Burdick, Milwaukie, andcharles R. Thomson, Portland, Oreg., assignors to Kloster- .l man Inc.,Portland, reg. 1 u

`Application FebruaryZl, 1932. SerialNol`595,`5i80 1 claim.

i This inventionrelates generally to door checks, and particularly to animproved fform of springactuated check having a hydraulic controllingdevice.,

. The main `object `of this invention" is the provision of an improvedform of `door check in which `the retarding action of vthe hydraulic"element Acmflfze adjustably@dispensed` with for the end `oi` 'theclosing operation.

` .'Ihe-secondvobject is to so construct the check ,as to simplify itsconstruction and to remove from the exterior thereofas many workingpartsas possible. ,i f .-,pl j fI'hese, and other objects, will become`more ap- *.15 parent from thespeciilcation following as illusgtrated in`thelaccompanyingdrawings, in which:

. Fig. 1 is an elevation of the device showing the door inan openposition.

`Fig.-2is a `plan showing` the parts in a closed 1F20 position in fulllines and in partial and fully opened position in dotted lines.

Fig. 3 is a section taken along the line 3--3 in Fig. 2.

Fig. 4 is a section taken along the line 4-4 in m5 Fig. c.

Fig. 5 is a section taken along the line 5-5 in Fig. 6. r

Fig. 6 is a section taken along the line 6--6 in Fig. 1 showing .theparts in a closed door posi- *1G30 tion.

l l Fig. 7 is a view similar to Fig. 6 showing the parts in adoor-closing position.

Fig. 8 is a section taken along the line 8--8 in Fig. 7.

Fig. 9 is a perspective view of the valve release rod.

Fig. 10 is a perspective view of the ball retainer. Fig. 11 is adevelopment of the cam surface. Fig. 12 is a4 sectional view through analternay@ 40 tive form of the device.

Similar numbers of reference refer to similar parts throughout theseveral views.

Referring in detail to the drawings, there is shown a door frame 12 onwhich is swung the oryg545dinary door 13. To the casing 14 of the frame12 is attached a screen door 15 by means of the hinges 16.

Referring particularly to this invention same will be seen to consist ofa base 17 having an 313.50 extending flange 18 by means of which it may55 or left hand check.

(Cl.` 16--53) i Within the portion 20 is a rotatable cam 24 Whichismounted upon a tubular stem whose `upper end is threaded to receive theadjusting screwv 26, and` Whose lower end is threaded to receive atubular` plug 27. I `Between the plug 27 60 and the screwv26 and withinthestem 25 is formed a valve seat123 `uponvvhich canresta ball check 29,which is` urged toward the seat 28 by a spring 30 whose compression iscontrolled by the setting of the screw 2 6., Y 6b Within Vthe t bularplug 27 is a valve release stem 31 having a cross shape stop 32 betweenthe `ends thereonwhich `stop is capableof a limited movement between theValve seat 28 and the upper end of` the `plug 27. The stem 25 isprovided 70 with outlet ports 33` directly` above the valve seat.28.-.

g The llower end `of `the stem 25 is provided with a shoulder34 againstwhich rests a piston` 35.

rThe piston 35 hasarecess 36A on the upper side 75 thereof whichreceives the combined compression and torsion spring 37, whose upper endreacts against the top 38 of the recess 39 on the under side of the base17. The piston 35 and the base 17 are provided with holes 40 to receivethe spring ends 41. The piston 35 is also provided withopenings 42capable of being closed by the ball check 43 which is conned within theen-V larged opening 44 by the ball retainer 45. The ball retainer 45 isheld in position by means of the .85 lock nut 46 on the tubular plug 27.The ball retainer 45 is provided with upturned arms 47 which projectinto the openings 44.

Upon the portion 20 is mounted a head 49 which is rotatable as well asslidable on the portion ,no 20. Within the head 49 are the lugs 50 whichengage the slot 51 formed across the diameter of the cam 24. `A. nut 52is rotatably mounted in the head 49 and receives the upper end of thescrew 26. The head 53 of the nut 52 engages the top .95 face 54 of thehead 49.

On the door 15 is secured an angle bracket 55 one side of which isprovided with a slot 56 which receives the elongated pin 57, which inturn is mounted in the end 58 of the arm 59 1 which, in this instance,is shown as integral with the head 49. The arm 59 is curved to providethe desired amount of clearance when the door l5 is wide open.

Surroundingthe piston 35 is a cylindrical shell lo 60 whose bottom end61 is closed and whose upper end 62 is threaded into the recess 39 ofthe base 17.

A suitable liquid 63 is placed within the shell 60.

The operation of the device is as follows: Assumming that the partsare'attached to a door (as 11 shown in Fig. 2), and an effort is made toopen the door, a rotating movement will be supplied to the head 49through the arm 59, and through the lugs 50 this movement is imparted tothe cam 24 causing an axially slidable movement thereof and acorrespondingly increased load on the spring 37.

It is assumed that the device has beenA assembled with the cam 24occupying the correct groove 22 or 23, depending upon whether the dooris right hand or left hand. This movement which raises the piston 35within the cylindrical shell 60 causes oil to rush through the openings42, unseating the ball checks 43 and offering only a minimum amount of.resistance .to the opening of the door, the actual amount exceeding onlyslightly that required to cornpress the spring 37. When the door isreleased the spring 37 attempts to return the parts' to their originalposition, causing the piston 35 t0 descend, and also causing the liquid63 to rush upwardly through the openings 42, carrying with it the balls43, which close the door andg'prevent the further passage of liquidtherethrough.

Oil is, however, passing through the opening within the valve seat 28,causing the ball 29 to be unseated under the control of the spring 30,whose compression has been regulated, as stated, by the screw 26. Theoil which passes the ball `29 goes out through the ports 33 to the topside of the piston 35. However, as the piston 35 descends, carrying withit the valve release stem 31, its lower end eventually strikes thebottom 61 causing a full release of the ball 29, entirely overcoming theaction of the spring 30 and permitting the final portion of the closingaction of the door to be performed by the spring 37, with no furtherresistance than exists in the natural friction of the door or itsoperating parts.

In the form of the device shown in Fig. 12 the k of David E. Riggins,Serial Number 582,907, over which this device is an improvement.

We claim:

A door check comprising a base having a flange for securing same to adoor frame, said base having an upright cylindrical shell dependingtherefrom, said shell being closed at its lowermost end, the upperportion of said base having a spirally grooved recess formed thereinconcentric with said shell, a cylindrical cam occupying said recess andhaving a portion thereof engaging said spiral groove, said cam beingcapable of a spiral movement with relation to said recess, a stemattached to said cam, a piston on the lower end of said stem includingan adjustably tensioned check valve opening under downward, movement ofthe piston and a second check valve opening It under upward movement ofsaid piston, a torsion spring surrounding said'stem between said baseand piston, a head rotatably mounted on said base in slidable relationthereto having driving connections to said'cam, a screw extending 095down through said head and threading into said stem, a spring betweenthe lower end of said screw and said adjustable check valve, a nutrotatably mounted in said head for locking said screw and a means forunseating said adjustable P check valve near theend of the downwardtravel of said piston. Y

EARL S. BURDICK. CHARLESl R.. THOMSON.

